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How do you patch the rom?

When I try to download any rom hack on my computer, it shows up as a .bps file. I found something that can change the rom to headered or unheadered, but it doesn't recognize the .bps file. I think that is what is happening with the emulator too. Any info so I can fix? Thanks!

I have been a Nintendo fan for years, and I decided to try to play a rom hack on my computer. I downloaded "Kaizo Kindergarten" By pangaeapanga, but for some reason, it doesn't work. It says bad checksum, and then goes into a black screen. The original mario world works, but not this one. ...